CVE-2022-4450
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- CVE-2022-4450
CVE Details
| Release Date: | 2023-02-07 |
Description
The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the \name\ (e.g. \CERTIFICATE\), any header data and the payload data. If the function succeeds then the \name_out\, \header\ and \data\ arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue.
See more information about CVE-2022-4450 from MITRE CVE dictionary and NIST NVD
CVSS v3.0 metrics
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
| Base Score: | 7.5 | Base Metrics: | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Access Vector: | Network | Attack Complexity: | Low |
| Privileges Required: | None | User Interaction: | None |
| Scope: | Unchanged | Confidentiality Impact: | None |
| Integrity Impact: | None | Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 7 (edk2) | ELSA-2023-13026 | 2023-12-06 |
| Oracle Linux version 7 (edk2) | ELSA-2023-13027 | 2023-12-07 |
| Oracle Linux version 8 (edk2) | ELSA-2023-13025 | 2023-12-06 |
| Oracle Linux version 8 (edk2) | ELSA-2023-2932 | 2023-05-24 |
| Oracle Linux version 8 (edk2) | ELSA-2023-32791 | 2023-12-06 |
| Oracle Linux version 8 (openssl) | ELSA-2023-12213 | 2023-03-28 |
| Oracle Linux version 8 (openssl) | ELSA-2023-1405 | 2023-03-22 |
| Oracle Linux version 9 (edk2) | ELSA-2023-13024 | 2023-12-06 |
| Oracle Linux version 9 (edk2) | ELSA-2023-2165 | 2023-05-15 |
| Oracle Linux version 9 (edk2) | ELSA-2023-32790 | 2023-12-07 |
| Oracle Linux version 9 (openssl) | ELSA-2023-0946 | 2023-02-28 |
| Oracle Linux version 9 (openssl) | ELSA-2023-12152 | 2023-03-01 |
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